<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="jquery-2.0.0.min.js"></script>
</head>
<body>
    <input type="button" value="btn" id="btn1">
    <div id="dv"></div>
    <input type="button" value="btn" id="btn2">
    <p>2</p>
    <p>1</p>
    <p>3</p>
    <p>4</p>
    <script>
        $("#btn1").click(function(){
            $("#dv").css({"width":"600px","height":"600px","backgroundColor":"pink"})
        });
        $("#btn2").click(function(){
            $("p").text("dskhfkjs")
        })
       
    </script>
    
</body>
</html>